RANKABLE EPA COUNTY AQI
Polk Air Quality - Iowa
EPA county-level evidence, NDS comparative intelligence, and 47 connected ZIP profiles.
Median AQI
46.0
Maximum AQI
136.0
Good-air-quality days
58.55%
Average PM2.5
7.898 ug/m3
NDS Air Quality Score
20.24
U.S. County Rank
950 of 1,049
Percentile
9.26
Grade
F
County status
Polk is part of the governed NDS rankable EPA county universe.
Connected ZIP codes
Methodology
EPA AQI evidence used here is county-derived. ZIP profiles connect to this evidence through the governed NDS geography relationship.